﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace WebApplication1
{
    public partial class WebForm1 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {

            }
        }

        protected void Button1_Click(object sender, EventArgs e)
        {
            //获取隐藏域控件的值
            String strValue = myHiddenField.Value;

            if (strValue == null || string.IsNullOrWhiteSpace(strValue))
            {
                this.Page.ClientScript.RegisterStartupScript(this.GetType(), "", "alert('空值!')", true);
                txtDemo.Text = "";
                return;
            }
            txtDemo.Text = "隐藏域的值是:" + strValue;
            this.Page.ClientScript.RegisterStartupScript(this.GetType(), "", "alert('隐藏域的值是: " + strValue + "')", true);
        }
    }
}